* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
body{
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  background: #2b2b2b;
}
label {
  position: relative;
  width: 120px;
  height: 60px;
  background: #222;
  display: flex;
  justify-content: space-between;
  align-items: center;
  box-shadow: inset 0 2px 15px rgba(0,0,0,0.2),
  inset 0 2px 2px rgba(0,0,0,0.2),
  inset 0 -1px 1px rgba(0,0,0,0.2);
  border-radius: 10px;
  transform: skewX(330deg);
  cursor: pointer;
}
label input {
  position: absolute;
  appearance: none;
}

label .angle{
  position: absolute;
  border-left: 35px solid transparent;
  border-right: 35px solid transparent;
  border-bottom: 60px solid #0f0;
  transform: skewX(30deg) scale(0.6) translateX(-16px);
  filter: drop-shadow(0 0 10px #0f0) drop-shadow(0 0 30px #0f0);
  transition: 0.5s;
}
label input:checked ~ .angle{
  border-bottom: 60px solid #f00;
  transform: skewX(30deg) scale(0.6) translateX(108px) rotate(180deg);
  filter: drop-shadow(0 0 10px #f00) drop-shadow(0 0 30px #f00);
}
label text{
  padding: 10px;
  color: #fff;
  transition: 0.5s;
  text-transform: uppercase;
}
label text:nth-child(2){
  color: #f00;
  transform: skew(30deg) scale(0);
  filter: drop-shadow(0 0 10px #f00) drop-shadow(0 0 30px #f00);
}
label input:checked ~ text:nth-child(2){
  transform: skew(30deg) scale(1);
}

label text:nth-child(3){
  color: #0f0;
  transform: skew(30deg) scale(1);
  filter: drop-shadow(0 0 10px #0f0) drop-shadow(0 0 30px #0f0);
}
label input:checked ~ text:nth-child(3){
  transform: skew(30deg) scale(0);
}